4 is 20% of 20. Hope this helps!
Answer:
<h2>x = -0.5</h2>
Step-by-step explanation:

Answer:
7. 28.8722
8. 21.7093
Step-by-step explanation:
458.29 x .063=28.8722
21.7093 x .0775= 21.7093
A. E-Commerce, I took a tech class :)
Answer:
best way would be calendar
Step-by-step explanation:
then stop watch
heartbeat
finding height?
(im not totally sure because it depends what type of timekeeping you're talking about)